a(n) = Sum_{k=0..10} binomial(n,k).

Terms

a(0) =1a(1) =2a(2) =4a(3) =8a(4) =16a(5) =32a(6) =64a(7) =128a(8) =256a(9) =512a(10) =1024a(11) =2047a(12) =4083a(13) =8100a(14) =15914a(15) =30827a(16) =58651a(17) =109294a(18) =199140a(19) =354522a(20) =616666a(21) =1048576a(22) =1744436a(23) =2842226a(24) =4540386a(25) =7119516a(26) =10970272a(27) =16628809a(28) =24821333a(29) =36519556